Word: screens
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Dates: during 1880-1889
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...series of lectures been given at Harvard more entertaining or instructive than Professor Cooke's lectures on the "Ice Fields of Switzerland." The effect of the lecturer's remarkable powers of vivid description is heightened by the use of a powerful stereopticon. View after view is projected on the screen, and it is difficult not to feel that one is actually transported to the land of mountains and glaciers. We would remind the students that the lectures begin promptly at seven o'clock, not at half past, as some seem to have got the impression...
...paper, advertisements and contents, with "please exchange" on the cover. They mean to play no second part to the journals of the effete East and the manner in which they receive any patronizing remarks makes the offending eastern editor glad that the Father of Waters and the Appalachians screen him. A fiery energy, a sort of expansion of spirit suited to their boundless country, but oftentimes too great for the resources of our mother tongue, characterizes them...
...illuminated pin holes in a metal card; or, in some instruments, any other image is used such as the reflection of micrometer lines in a star. Any change in the surface of the mercury causes a blurring of this image, which is reflected from the mercury upon a screen. The reflection is observed by means of a telescope or microscope placed so as not to be easily jarred. The utmost delicacy is obtained by this arrangement, for if a sufficiently high magnifying power is used, a movement along the screen of the reflected spot or image a thousandth part...
...mercury surface at 11.17.30, and from that time disturbance waves came at nearly regular intervals of about 18 seconds, until the maximum was reached on the fourth or fifth wave. Then the impulses declined in force and died away about as they had come. In addition to the screen Prof. Rogers made use of direct observation of the mercury surface through a microscope, thus giving him the added advantage of judging the wave's length, etc. which a direct view of them would furnish...
...attract his attention in the exterior of the house, unless it be the care with which that sanitary law has been observed, which demands that the cold air box to the furnace shall have its mouth at least three feet above the ground, and covered with a wire screen. There are few visitors; perhaps because the students hesitate to take their friends to the rooms, lest they intrude upon the privacy of the family whose home it is. If you enter, you find, on the left, a parlor which is used occasionally as a recitation room, and the rest...